PDF malware analysis — malicious · 73b680441e9abf89

MALICIOUS

PDF

14.6 KB Created: 2009-11-15 19:41:70 Authoring application: PDF Library 4.3.9 (via PDF Library 3.9.7)

MD5: 7ee47db66dcda724a604fafb84907e9c SHA-1: 14e342618c3a65d487c1cdca4b3240ec109a5245 SHA-256: 73b680441e9abf890b63e059e7b103d22db3aefa733ddcfd2ba359658117b1a4

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by multiple engines, including ClamAV which identified it as Win.Trojan.Agent-36166. Static analysis revealed embedded JavaScript, which is commonly used to download and execute further malicious content. The ML classifier also strongly indicated maliciousness. The obfuscated JavaScript is likely responsible for fetching and running a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 4

ClamAV: Win.Trojan.Agent-36166 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Trojan.Agent-36166
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `10e468435cc781add99019971fa3e4bc79586fecfeb9ee84462560bd848634e3`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	75196 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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